WALL-COLUMN FRAME MODEL OF RC SLIT WALL

Analysis models of slit wall suggested by JGJ99-98 are discussed. The necessity of considering shear deformation of web of steel beams is pointed out in determining the section of equivalent cross bracing or shear plate. It is also found the models suggested by JGJ99-98 can neither predict the actual shear forces in steel beams, nor account for bending deformation. Therefore, a wall-column model is suggested, and the rigidity of each part in this model is proposed. A very low axial rigidity is assigned to the wall-column modeling slit walls to implement the design philosophy of carrying no vertical loads by slit walls. Comparisons between three models are carried out and it is found that, when the number of stories was small, the wall-column models yield the lowest lateral stiffness. As the height of the structures increases, three models yield nearly the same lateral stiffness. But the wall-column model can correctly predict the internal forces of each member in the model, thus indicating an improvement over the cross bracing or shear plate models. At last, the shear key was proposed to be added between the column and silt walls so as to improve the behaviour of girders.